Package: Total 20 PCS computer case thumb screws, sufficient number to meet your needs. Easy to Install: Thumb screw design allows for easy, tool-less removal ideal for computer case panels. The computer thumb screws offer duplicate convenience in the event you need to re-open the computer case, as the thumb screws can be removed by hand without a screw driver. Widely Application: suitable for Computer case, PCI slot, or motherboard mounting; Fits most desktop computers.